Marty , there are many ways to record your performance..
If I recall you are buying a keyboard with a mic input..If that is the case, you can come out of the keyboard[stereo outs] into your recording device..
If you are using an external mixer..run your mix out of the mixer outputs[or record out jacks], to your recording device..

Some of the recording devices we use are as follows:
MP3 recorders such as Nomad.
Mini disc recorder[Sony, Sharp].
Digital recorders[Tascam,Roland, Korg, Zoom ,Yamaha etc].
Computer HD recording, Desktop and laptops[this is my preference, you have access to all your editing programs, and burn to CD]..